* • ControlMechanism
  assign_as_controller:  fixed bug (assignment of self.allocation)

* • Project
  - Delete ASSIGN everywhere except in OutputState and Keywords

* • LearningMechanism failing

* • LearningMechanism
  _validate_params:
      replaced try and except for learning_signal[PARAMS][PROJECTIONS]
      with if-else

• OutputState:
  _parse_state_specific_specs:
      refactored for VARIABLE in place of INDEX in 3-item tuple

* • LearningMechanism
  _validate_params:
      replaced try and except for learning_signal[PARAMS][PROJECTIONS]
      with if-else

• OutputState:
  _parse_state_specific_specs:
      refactored for VARIABLE in place of INDEX in 3-item tuple
  docstring revised per above

* -

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* • ControlMechanism
  assign_as_controller:  fixed bug (assignment of self.allocation)

* -

* • ControlMechanism
  assign_as_controller:  fixed bug (assignment of self.allocation)

* -

* • OutputState
  docstring revs

* • ControlMechanism
  assign_as_controller:  fixed bug (assignment of self.allocation)

* • Mechanism
  added MechParamsDict as dict subclass

• OutputState
  _parse_variable_spec: checks that dicts passed to it are MechParamsDict

* • ControlMechanism
  assign_as_controller:  fixed bug (assignment of self.allocation)

* • Function
  - UserDefinedFunction:
      docstring revs

* • Function
  - UserDefinedFunction:
      examines arguments of custom function to assign as params

* -

* • Function
  - UserDefinedFunction:
      - identifies modulatory params
      - works with lamda functions
      - works with position and keyworded arguments
      - passes all tests

* -

* • Component
  _get_current_execution_time:  added method

* • Component
  _get_current_execution_time:  added method

* -

* • Gating Mechanism with UDF:
  debugging OutputState function assignment

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* • Component
  _assign_args_to_param_dicts():
      added defaults argument that also defaults to be passed
      (that override those specified as argument values in init

* • Component
  _assign_args_to_param_dicts():
      added defaults argument that also defaults to be passed
      (that override those specified as argument values in init

* -

* -

* • Function
  UserDefinedFunction: docstring examples added

Incorporate changes to LearingFunctions from old PR:
  - remove activation_function from constructors
  - docstring changes
  - other minor stuff?

* • ControlMechanism
  assign_as_controller:  fixed bug (assignment of self.allocation)

* • Function
  UserDefinedFunction:
  - fixed some bugs examples

* • Function
  UserDefinedFunction:
  - fixed some bugs examples
  - doctest is now run on examples

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* • Function
  UserDefinedFunction:
    - fixed bugs in examples
    - doctest is now run on examples

* • Function
  UserDefinedFunction:
    - fixed bugs in examples
    - doctest is now run on examples